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                        条件判断语句
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                            <b>1.4.</b>
                        
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                            <b>2.1.</b>
                        
                        while语句的使用
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                            <b>2.2.</b>
                        
                        for语句的使用
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                        break和continue的使用
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                            <b>2.4.</b>
                        
                        嵌套循环
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                            <b>2.5.</b>
                        
                        for...else语句的使用
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                        <h1 id="&#x5D4C;&#x5957;&#x5FAA;&#x73AF;">&#x5D4C;&#x5957;&#x5FAA;&#x73AF;</h1>
<p>&#x524D;&#x9762;&#x5B66;&#x4E60;&#x8FC7;if&#x7684;&#x5D4C;&#x5957;&#x4E86;&#xFF0C;&#x60F3;&#x4E00;&#x60F3;if&#x5D4C;&#x5957;&#x662F;&#x4EC0;&#x4E48;&#x6837;&#x5B50;&#x7684;&#xFF1F;
&#x7C7B;&#x4F3C;if&#x7684;&#x5D4C;&#x5957;&#xFF0C;while&#x5D4C;&#x5957;&#x5C31;&#x662F;&#xFF1A;while&#x91CC;&#x9762;&#x8FD8;&#x6709;while</p>
<h2 id="while&#x5D4C;&#x5957;&#x7684;&#x683C;&#x5F0F;">while&#x5D4C;&#x5957;&#x7684;&#x683C;&#x5F0F;</h2>
<pre><code class="lang-python"><span class="hljs-keyword">while</span> &#x6761;&#x4EF6;<span class="hljs-number">1</span>:
        &#x5916;&#x5FAA;&#x73AF;&#x4EE3;&#x7801;&#x5757;
        <span class="hljs-keyword">while</span> &#x6761;&#x4EF6;<span class="hljs-number">2</span>:
            &#x5185;&#x5FAA;&#x73AF;&#x4EE3;&#x7801;&#x5757;
</code></pre>
<p><strong>&#x5185;&#x5FAA;&#x73AF;&#x4E00;&#x65E6;&#x5F00;&#x59CB;&#xFF0C;&#x5219;&#x8981;&#x6267;&#x884C;&#x5230;&#x6761;&#x4EF6;2&#x4E0D;&#x6EE1;&#x8DB3;&#xFF0C;&#x624D;&#x4F1A;&#x7EE7;&#x7EED;&#x6267;&#x884C;&#x5916;&#x5FAA;&#x73AF;&#x7684;&#x4EE3;&#x7801;&#x3002;</strong></p>
<pre><code class="lang-python">i = <span class="hljs-number">0</span>  <span class="hljs-comment"># &#x5185;&#x5916;&#x5FAA;&#x73AF;&#x7684;&#x63A7;&#x5236;&#x53D8;&#x91CF;&#x4E0D;&#x80FD;&#x4E00;&#x6837;</span>
<span class="hljs-keyword">while</span> i &lt; <span class="hljs-number">5</span>:

    j = <span class="hljs-number">0</span>  <span class="hljs-comment"># &#x5185;&#x5FAA;&#x73AF;&#x7684;&#x63A7;&#x5236;&#x53D8;&#x91CF;&#x5FC5;&#x987B;&#x8981;&#x5728;&#x5916;&#x5FAA;&#x73AF;&#x91CC;&#x521D;&#x59CB;&#x5316;</span>
    <span class="hljs-keyword">while</span> j &lt; <span class="hljs-number">5</span>:
        print(<span class="hljs-string">&apos;j= %d&apos;</span> % j)
        j += <span class="hljs-number">1</span>

    print(<span class="hljs-string">&apos;i= %d&apos;</span> % i)
    i += <span class="hljs-number">1</span>
</code></pre>
<h2 id="&#x7EC3;&#x4E60;">&#x7EC3;&#x4E60;:</h2>
<ul>
<li>&#x6253;&#x5370;&#x5982;&#x4E0B;&#x56FE;&#x5F62;</li>
</ul>
<pre><code class="lang-python">*
* *
* * *
* * * *
* * * * *
</code></pre>
<ul>
<li>&#x6253;&#x5370;&#x4E5D;&#x4E5D;&#x4E58;&#x6CD5;&#x8868;&#x3002;</li>
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